Q. 18 - Biology

Question

The elbow is an example of which type of joint? 

1. hinge 
2. pivot 
3. saddle 
4. gliding 

Step-by-Step Solution

Answer

The correct answer is option (a).

The elbow is an example of hinge joint. 

Hinge joint

• The hinge joint is formed of hyaline cartilage, which is lubricated by synovial fluid, which connects two or more bones. 
• In order for hinge joints to work, one plane must be able to bend and extend, and another plane must only move very slightly. 
• A crucial part of the intricate biomechanics of the human body is the hinge joint. 

Step: 1 Explanation for Correct answer

• Three bones, the humerus, ulna, and radius, form the elbow's hinge joint.
• Elbow movement only occurs in one plane because it is a hinge joint.
• Forearm movement at the elbow joint is a part of elbow joint movements. Thus, the option a is correct.

Step: 2 Explanation for incorrect answer

• The neck's first and second vertebral joints, which permit back-and-forth movement of the head, are an example of a pivot joint.  So, option b is wrong.
• Thumb joints are a good example of saddle joints. So, option c is wrong as well.
• The wrist joint is an example of a gliding joint. Hence, option d is wrong too.